Warp stop mechanism for looms



My 2, 192%d Q Hi. DRAPER 1,719,262. 4 WARP S'fOlMECHANISM FOR LOOMS lFiled May 14, 1928 sheetS-sheet 1 Arrow/vnf construction for sustaining the parts associated therewith. In the present instance l these parts are indicated as being substantially the same as those of the Davis and J ohnson patent, above mentioned-. v

Extending from the su ports 4 are'the lugs 5 in which is mounte the` rock vs aft 6 which may beactuated oivrocked by, l arm l. "14 connected to the vdownwardly extending rod 8 reciprocated from ,any uual going part of the loom. Thef rock shaft has a series of rockersf 9 on which are mounted the actuators 10. The `:actuators 10, of which there may be any suitable number in accordance with the number of banks of drop wires, are mounted upon the rocker or rockers for Anormal movement therewith but capable of having relative movement. l

The rockers 9 and the actuators 10`may be substantiallyl as more full shown and described in the' Davis and ohnson patent, it

- being understood that the actuators l0 are connected yieldingly to the rocker element or elements by a spring 11, with the result thatV if the actuator 10 is arrested in its movement with the rocker orrockers it may tilt relatively thereto on one of its ful- 'cra 12, substantially as described in th Davis and Johnson patent.

.-.Pivotally supportedupon the rocker 9 at 13 is a finger 14, and'at a point opposite the .y Extendin finger 14 there is a pivotal connection 15 with the associated 'actuator 10, in which respect the details of such' mechanism may be the same as in the Davis and Johnson patent.

l beneath the series of fingers 14', of which there are a number corresponding tothe number of. actuators 10,`is an arm 16 which bears upon the plunger 17 associated with a fiexible sheathed wire 18, substantially the same in all respects as described in the Davis and J ohnson-pat-ent, and

v for which reason further detailed description4 appearsto be'unnecessary. d.

The fixed or stationary toothed detector bar'19 is secured to the side supports 4, one at each side oit the loom,` as indicated in Fig.

'1, and if desired the fixed detector ba'r 19 may be slotted longitudinally, as usual, for

' the nreception'of the transversely movable deteetor bar 20. Any appropriate construction of means for associating ,the movable and fixed detector bars may lbe employed,

but that indicated andl generally described as above `forms a good practical embodiment'of this feature.

Each'of the movable detector bars 2 0 is connected to its'associated actuator 10 by means of a link 21, the result being that upon rocking move ent of 'the lrock vshaft 6, the actuators 10 lwill cause the movable g toothed detector. bars 20 to be moved transv.versely of the loom, as usual in this general type of Warp stop mechanism.

Extending between the side supports 4, one at'each lsideof the loom, are warp supports 22, and, as usual, there may be any appropriate number of these warp supports and they may beconstructed and connected to the side supports in various ways so far as the present invention is concerned.

As will be indicated from Fig. 1, the drop "wires 23- are arranged in a suitable number of banks and each bank is associated' with a ixcd'and movable toothed detector bar. In the present instance of the invention the drop wires are indicated as having elongated slots 24 at their upper portions and through the elongated slots 24 of each bank of drop wires the toothed detector bars pass. Each of the drop wires 23 is likewise provided with a Warp engaging portion 25 and, in the present inst-ance of the invention, the

warp engaging portion 25 is constituted as4 a hole or opening formed in the drop wire, through which a warp thread passes. It is obvious, of course, that various forms of drop wires and Warp supporting features thereof may be employed 1n the present invention.

As indicated in Figs. 2 to 5 inclusive, the fixed toothed detector bar 19 is provided with a series of wedge-shaped teeth 26, the

-detector bar teeth 26.

Thus, as more clearly indicated in Figs. 2

to 5, the reversely arranged wedge-shaped teeth of the fixed and movable detector bars have their co-acting or adjacent inclined edges parallel throughout the length thereof extending continuously from the flat to drop wire supporting-surface of each toot 1 to the bottom thereof, and, as shown, them,

teeth 29 of the transversely. movable detector bar extend above the flat top surface of the teeth of the fixed detector bar.

On the `occurrence-not a warp fault, the

relea'sed drop wire may at times during the relative movement of the detectorbars, drop between the teeth thereof, or it. may drop onto the fiat top supporting sgrface 28 of a tooth of the fixed 'detector` bar,'as in Fig. 2, and be held raised-21h' -this latter case the dro'p wire 23 will be moved laterally by a tooth of the' movable detector bar, which mentof the released drop wire, it will enleo extends above the top of thetooth of the' fixed detector, and during such lateral move- .while the moving tooth released drop inmensa gage the adjacent drop wires in. its path of movement and push them m the same direcf tion along with the associated warp threads, thus effectively opening the warp. On the other hand, the released drop wire may'fall upon the top supporting surface of a tooth of the transversely movable detector bar, with the result that vit will be held fromv ilateral movement by the adjacent drop Wires l passes and then be permitted to fall eitherbetwecn the teeth of the fixed detector bar, as in Fig. 3, or

onto the fiat top supporting surface thereof,

as in F ig. with the result, in the latter case, on the return movement of the movable detector bar,the released drop ,wire and the adjacent drop wires will be moved laterally by the moving tooth and effect lateral separation of .the warp threads.

`When a released drop wire falls between the teethof the movable and fixed detector bars in position to effect loom stoppage,` it is important that it shall not be lifted again as it is engaged between the teeth` and to this end the angular inclination of the sides of the wedge teeth on the movable detector bar, which engage and move the released drop wire laterally, is such that while the drop wire will bel given a bodily deflection when clamped between the inclined surfaces of the teeth, there will be no tendency to lift the tion'. p y i This feature of the invention is more .clearly indicated in Fig. 4t, vwherein the line (t represents a vertical planepassed through.

the bottom terminal end of' an inclined edge of one of the movable teeth 29. 'The angle i), subtended between the vertical plane ci and the inclined edge 30 of the lmovable tooth, is less than 450. This may be otherwise stated, to the effect that the angle c between the inclined edge 30 and the 4horif/iontal base of the tooth is greater than 45", the result being that when a drop wire is engaged by the inclined edge 30 of a movable tooth, as indicated in Fig. et, and is moved laterally, there' w1ll be no tendency of the. inclined pushing edge to lift the released drop wire.

As further insurance against upward dis` placementv of the released drop wire as it is engaged between the teeth of the detector bars', each of the drop wires Q3 hasfa toothengaging portion 32 which may be of less height than the inclined upwardly diverging side edge of the teeth of the fixed detector bar, the result bein In other words, the top of the fixed tooth as wire from its dropped posi-v g that when a drop wire is engaged between a tooth of the fixed de-V it inc'lines upwardly and divergently, will overlie the top of the portion 32 of the fallen rop wire and prevent or lock it from uplward movement as the drop wire itself is 'moved laterally by the movable detector bar and finally clamped'between and deflected by the lco-acting inclined edges of the movable and tixed teeth of the detector .bai-s.

This feature of the invention is important because when the drop wire is moved laterally bythe movable detector bar, it is called upon to move a number of drop wires and their associated warp threads so that a lock to prevent upward movement of the released drop wire as it is moved laterally by the movable detector bar insures loomv stoppage and final location of the warp fault by the separated drop wires and warp threads and the Adeflected drop wire clamp between the inclined surfares of the cooperating teeth.

-`What is claimed is: Al. In a warpstop mechanism, the combination of a fixed detector barhaving wedge shaped teeth the side edges of which diverge upwardly at a sm'all angle to the vert-ical and are provided at their upper ends with fiat drop wire supporting surfaces, a transversely movable detector bar having wedge shaped teeth provided with fiat upper drop wire supporting surfaces and downwardly diverging inclined edges that form a small angle to the vertical and are longer t-han the side inclined edges of the fixed detector'bar teeth, and a series of drop wires having teeth engaging portions adapted to be elampedbd tween the inclined edges of the teeth to deflect a fallen drop wire.

i, 2. ln a' warp stop mechanism, the con1bi nation of 'a fixed detector bar having wedgev shaped teeth the side edges of which diverge upwardly'and `are provided with flat' drop wire supporting u p per surfaces, a transversely movable detector bar having wedge shaped teeth kwith downwardly divergiiig edges inclined at substantially less than l(T to a vertical. plane passed through the terminal ofthe inclined edge end adapted to engage and move a drop wire against a fixed toothl without exerting an upward wedging action uponthe wire, and a series of drop Wires having teeth engagingpor provided with flat upper drop wire supporting surfaces and edge portions inclined at 1 substantially Aless than iOto a vertical plane passed through the terminal portion of the edge and adapted to grip a dropwire with outexerting an upward wedging action upon' the drop wire, and a series of drop wires through which thedetector bars pass.

1 4l, 'in warp stop mechanism for looms,

the combination of a series of drop wires 'i normally supported by the warp threads during weaving, a transversely movable detector bar having wedge' shaped teethy with side edges diverging 'downwardly at an angle substantially less than 45 to a vertical plane passed lthrough the terminal portions of said edges that a' fallen drop wire may be moved laterall and not raised or subjected to an upwar wedging action by .wedge shaped'teeth provided with upward- 5. In a warp stop mechanism for looms,

i the combination of a series of drop wires normally supported by the'warp threads duredges ofwhieh diverge downwardlyat an leo L; the combination of a Xed detector bar hav? nde titor 'bar teeth.

ing weaving, a transversely movable detector bar having wedgev shaped teeth the side angle less than 45 to a vertical plane passed through 'the `terminal portions of said edgesv that a fallen drop wire may be moved laterally and 'not raised or subjected to an upedges parallel to the side edges of the-movableteeth' and flat upper drop wire supportingr-"surfaces 'of less height than the movable yF16. In -a warpy stop mechanism for looms,

ing'. wedgeshaped teeth, the side yedges 'of which diverge upwardly and form horizontal drop wire supporting surfaces between vthe upper ends of the side edges, a transversely movable detector bar having wedge shaped teeth, the side edges of which converge .Y upwardly vforming horizontal drop wire supporting surfaces higher than the drop wire supporting surfaces of the fixed detector bar teeth, said teethbeing 'adapted to grip a drop wire between their inclined edges without exerting an upward lifting action upon the drop wire anda series of drop wires through which the toothed detec tor bars pass.

7. Ina warp .stop motion of the transversely movable toothed detector bartype,`

the combination of a fixed detector bar having wedge shaped teeth the side edges'b of which diverge upwardly, a transversely movable detector bar having wedge shaped teeth that diverge'downwardlyat a" small angle. to the vertical, and a series of drop wires through which the detector bars pass having tooth 'engaging .portions of less height than the wedge shaped teeth of the tixeddetector bar so that when a fallen drop wire is moved by a tooth' of the movable dctector bar Vinto engagement with an inclined edge; of a tooth of the iized detector bar the to of the drop wire tooth engaging portion willbe belowr the top oi the wedge tooth of thexed detector bar and be prevented from moving upwardly as it is defiected by the teeth of the detector bars to locate the warp fault. 8. In a warp stopmotion for looms, the

combination of a series of drop wires having teeth engaging portions, a movable detector bar having wedge sha ed teeth that diverge downwardly at a smal? angle to the vertical, a`ixed detector. bar having wedge shaped teeth that diverge upwardly to a greater nclined height than the teethv 'engaging por- 'tion of a fallen drop wire to overhang the top of said portion of the drop wire and 'prevent upward movement ofl the drop wire as'it is moved and deflected by the teeth of the detector bars to locate the warp fault.

9. In a warp stop mechanism' for looms, the combination of a series of drop wires having teeth engaging portions, a fixed detector bar-having wedge shaped teeth, theside edges of which diverge upward and terminate with flat top supporting surfaces between themonwhich a released drop wire may be supported, a movable detector bar having wedge shaped teeth 'of greater height than the wedge shaped teeth of the fixed detector bar and provided with side edges presenting uninterrupted inclines divcrging downwardly throughout the height of theteeth at a small angle tothe vertical.

In testimony whereof, I have signed my name to this specification.

CLARE H DRAPER- 

